4.2 Strengthening Materials to Improve Function and Safety

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why the bridges failed! interactive:


http://www.pbs.org/wgbh/nova/tech/bridge-collapse.html


Corrugation strengthens flat materials (like paper and cardboard):




Lamination strengthens matherials:


http://en.wikipedia.org/wiki/Lamination


Reinforced Concrete:



http://civilbasics.weebly.com/2/post/2011/10/advantages-of-rcc-reinforced-cement-concrete.html